5-1SectionConnecting to the Host’s RS-422A/485 Port
69
communications
cable can be up to 500 m long with this method. This connec
-
tion
method can
only be used with the 1:N NT Link (standard or high-speed).
PT
Host
RS-485
cable
(T
otal length 500 m max.)
Link Adapters
RS-232C cable
(2 m max., not
required with the
NS-AL002.)
Note One
end of the wire must always be connected
to the host (PC), and there must
be no branching. Branching will cause problems such as transmission delays
and communication failures.
NT21
NT21
PC
PC
NT21
PC
NT21 NT21NT21 NT21 NT21 NT21 NT21
(Terminated)
Relay Terminal Block Relay Terminal Block
Max.
2 m
(Not
terminated)
(Not
terminated)
(Not
terminated)
(Terminated)
Example of Good Connection Examples of Bad Connections
Reference: CS/CJ-series CPU Units cannot be connected with the 1:1 connection NT link
method. Use the 1:N connection NT link method (standard or high-speed)
instead
of making the 1:1 connection. For details,
refer to
Using the 1:N NT Link
Method (page 80) or Using the High-speed 1:N NT Link Method (page 83).
5-1-1 Host Types and Settings
This
section lists the hosts that have RS-422A ports that can be connected to a
PT and describes the settings required at the host.
When Using the Host Link Method
Compatible Host Units
Some models and series of OMRON PCs have the RS-422A type Host Link
function built in. With a CS series, CJ series, and CQM1H Board or Unit, and
CQM1H,
the Host Link method can be used by installing a Serial Communica
-
tions Board. In addition, some C200HX/HG/HE(-Z)E devices have an integral
CPU Unit that can be connected in the Host Link method by installing a Serial
Communications Board.
With the CPM2A and CPM2C, an RS-422A type of 1:1 NT Link can be con-
nected through a CPM1-CIF11 RS-422A Adapter.
Check
the model and series of the PC and the type of the installed Board or Unit
before making a connection.
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